Tesco, Asda and Sainsbury's have all exceeded the total market growth rate for the latest period. Their combined share now accounts for nearly 65% of the grocery market.

The independent sector - including off-licences and drink outlets selling food - has suffered over the years, but the remaining outlets have found their niche as they have also outperformed the market and lifted share from 2.7% to 2.8%, TNS said.